Abstract : The revised Strong Vocational Interest Blank (SVIB) and a background information form were administered to 1378 computer programmers. The total group of participants was reduced, for major analyses, to 1003 male programmers who had at least two years of programming experience, whose jobs consisted primarily of non-supervisory programming tasks, and who indicated satisfaction with programming as an occupation. Programmers differ from other professional men primarily in their greater interest in problem-solving activities, including both mathematics and mechanical pursuits, and their lesser interest in people. A Programmer interest key was developed on one half of the sample and evaluated on the remaining half. The key provides good differentiation between programmers and men in general, and programmers satisfied with their occupation score significantly higher than dissatisfied programmers. Several key construction techniques were applied. One that is still in process may provide a more effective key. Normative data are provided for the key, and its potential usefulness in counseling, guidance, and selection are discussed. (Author)